Overview
The ISO1500DBQR is a galvanically-isolated differential line transceiver designed for TIA/EIA RS-485 and RS-422 applications. Produced by Texas Instruments, this device features a 3-channel digital isolator and an RS-485 transceiver integrated into an ultra-small 16-pin SSOP (DBQ) package. It is optimized for long-distance communications, breaking ground loops between communicating nodes and allowing for a larger common mode voltage range. The ISO1500DBQR operates over a wide ambient temperature range from –40°C to +125°C and supports supply voltages from 1.71 V to 5.5 V on the logic side and 4.5 V to 5.5 V on the bus side, making it compatible with low-voltage FPGAs and ASICs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SSOP (DBQ) | - |
| Pins | 16 | - |
| Operating Temperature Range | –40 to 125 | °C |
| Data Rate | 1 Mbps | - |
| Logic-side Supply Voltage (VCC1) | 1.71 to 5.5 | V |
| Bus-side Supply Voltage (VCC2) | 4.5 to 5.5 | V |
| ESD Protection | ± 16 kV HBM | - |
| Isolation Voltage | 3000 VRMS for 1 minute | - |
| Common-mode Transient Immunity | 100 kV/µs (typical) | - |
| Unit Load | 1/8, up to 256 nodes on bus | - |
Key Features
- Meets or exceeds requirements of TIA/EIA-485-A
- Half-duplex transceiver with low-EMI 1-Mbps data rate
- Bus I/O protection against IEC ESD contact discharge and IEC EFT events
- Failsafe receiver for bus open, short, and idle conditions
- Glitch-free power-up and power-down for hot plug-in
- Ultra-small SSOP (DBQ-16) package
- Safety-related certifications including UL 1577, IEC 60950-1, IEC 62368-1, and IEC 61010-1
Applications
- Electricity meters
- Protection relay
- Factory automation and control
- HVAC systems and building automation
- Motor drives
Q & A
- What is the ISO1500DBQR used for?
The ISO1500DBQR is used for long-distance communications in TIA/EIA RS-485 and RS-422 applications, providing galvanic isolation between the communicating nodes.
- What is the operating temperature range of the ISO1500DBQR?
The device operates over a temperature range from –40°C to +125°C.
- What are the supply voltage ranges for the ISO1500DBQR?
The logic-side supply voltage (VCC1) ranges from 1.71 V to 5.5 V, and the bus-side supply voltage (VCC2) ranges from 4.5 V to 5.5 V.
- What is the data rate of the ISO1500DBQR?
The ISO1500DBQR supports a data rate of 1 Mbps.
- Does the ISO1500DBQR have ESD protection?
Yes, the device has ± 16 kV HBM ESD protection.
- What is the isolation voltage of the ISO1500DBQR?
The device provides 3000 VRMS of isolation for 1 minute per UL 1577.
- What certifications does the ISO1500DBQR have?
The device has certifications including UL 1577, IEC 60950-1, IEC 62368-1, and IEC 61010-1, among others.
- What package type does the ISO1500DBQR come in?
The device is packaged in an ultra-small 16-pin SSOP (DBQ) package.
- Is the ISO1500DBQR suitable for hot plug-in applications?
Yes, the device supports glitch-free power-up and power-down for hot plug-in applications.
- What are some typical applications of the ISO1500DBQR?
Typical applications include electricity meters, protection relays, factory automation, HVAC systems, and motor drives.
